ADS-B

Automatic
Dependent
Surveillance -
Broadcasting

Unlike traditional radars, where a ground-based radar transmits “interrogating” signals and uses the “replies” from aircraft transponders to determine the location, ADS-B equipped aircraft broadcast their GNSS positions through ADS-B message once per second.

The information received by the ADS-B ground station includes the aircraft's identification, altitude, speed, velocity and other useful information.

Composite surveillance provides a combination of ADS-B and Wide Area Multilateration in a single deployment to take advantage of both technologies and not depend on data from only the aircraft's navigation system.

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